Air pump



FIG. 1 is a front and top perspective view of the air pump showing my new design;

FIG. 2 is front elevational view of the air pump showing my new design;

FIG. 3 is a rear elevational view thereof

FIG. 4 is left side elevational view thereof;

FIG. 5 is a right side elevational view thereof,

FIG. 6 is top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

All broken lines are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for an air pump, as shown and described. 